The protests will be held from 11.30 am to 4 pm on Wednesday, says senior union leader Jhanda Singh. State health authorities ask patients to stop using flagged batches as 70 drug samples produced in the state fail critical ingredient tests while 22 show minor defects. Samples from 73 companies in Solan, 18 in Sirmaur and two in Una fail to meet prescribed standards; action to be taken under Drugs and Cosmetics.